Spring 10 - Name CHEM 340.01 Biochemistry I Exam 2Protein...

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Name: _________________________________________________________________________________________________________ 1 CHEM 340.01: Biochemistry I Exam 2-­૒Protein Function March 17, 2010 Part I-(50 pts.) : 2 pts. Each. Page 1 Page 2 Page 3 Page 4 1 C 7 D 15 A 22 B 2 B 8 B 16 B 23 B 3 A 9 D 17 C 24 B 4 C 10 B 18 D 25 A 5 C 11 D 19 C 6 B 12 D 20 B 13 A 21 C 14 C Part II: True or False (20 pts.) 1 pt. for each correct T or F, 4 pts. for each valid justification. 26) __ T __. With respect to oxygen binding, the distinguishing trait between Mb and Hb is cooperativity in Hb and noncooperativity in Mb. The cooperativity is due to the tetrameric structure of Hb. A Hb monomer would behave like Mb because it does not interact with any other subunits and can’t be cooperative. 27) _ F __ To be catalytically perfect, an enzyme has to have a k cat /K M value that is close to 10 9 M -1 s -1 . The k cat value alone isn’t enough to determine if it is catalytically perfect. 28) __ F __ Since enzymes’ active sites are mostly complementary to the transition state of the substrate, it would be most effective if the drug was made to look like the transition state and not the ground state.
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